I posted this to the Fedora-list, but thought I might get some
additional information here as well.
I have a HD that refuses to mount with a 'bad magic number in
super-block'. I'm running FedoraCore 6 x86_64.
[root@moe ~]# fdisk -l /dev/hdc
Disk /dev/hdc: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdc1 * 1 13 104391 83 Linux
/dev/hdc2 14 9729 78043770 8e Linux LVM
[root@moe ~]# mount -t ext3 /dev/hdc2 /Big-Drive/
mount: wrong fs type, bad option, bad superblock on /dev/hdc2,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
[root@moe ~]# e2fsck -b 11239425 /dev/hdc2
e2fsck 1.39 (29-May-2006)
e2fsck: Invalid argument while trying to open /dev/hdc2
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
[root@moe ~]# !624
mke2fs -n /dev/hdc2
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
9764864 inodes, 19510942 blocks
975547 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
596 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632,
2654208,
4096000, 7962624, 11239424
I've tried 'e2fsck -b (superblock) /dev/hdc2 on all the superblocks
listed above to no avail.
I've read about 'mke2fs -S' as being a possible solution, however I see
that it is recommended as a last resort. Therefore I have held off on
trying that method.
I'm afraid I'm toasted, however I'm still hopeful that I might recover
some (or all) of my data.
Have I overlooked something?
Thanks,
Mike
--
IBM: Insanely Better Marketing
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Linux Registered User #241685 http://counter.li.org
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